Two-Stage Ink Drying for Fast Curing Without Media Denaturation
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Solution Overview
Problem
Existing drying technologies using high-frequency voltage to dry pigment ink on media risk thermal denaturation of the medium.
Innovation Solution
A drying device with a heating section that vaporizes water and solvent in two stages, using electromagnetic waves and contact sections to sandwich the medium, followed by air removal, maintaining medium quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency voltage is supplied between electrodes to dry pigment ink on medium, then drying speed is improved, but thermal denaturation of the medium may occur
Solution Approach 1:
The drying process is segmented into two distinct stages: a first drying stage using high-frequency voltage between electrodes to rapidly evaporate water, and a second drying stage using a heating section to slowly evaporate solvent. This segmentation allows each stage to optimize for its specific purpose while avoiding the harmful effects of using high-frequency voltage throughout the entire drying process, thus preventing thermal denaturation while maintaining high drying speed.
Solution Approach 2:
The drying device employs periodic action by sequentially switching between two drying modes: first, applying high-frequency voltage to electrodes for rapid water evaporation, then transitioning to a heating section for gradual solvent evaporation. This periodic switching between different drying mechanisms enables efficient drying while controlling thermal exposure to prevent medium denaturation.
2Productivity
If high-frequency voltage is used to vaporize liquid quickly, then drying efficiency is improved, but quality of the medium deteriorates due to thermal damage
Solution Approach 1:
The drying function is segmented into two separate systems: an electrode-based high-frequency voltage system for rapid water evaporation, and a heating section for gentle solvent evaporation. This segmentation enables the system to achieve high drying efficiency through the first stage while protecting medium quality during the second stage, resolving the contradiction between drying efficiency and medium quality.
Solution Approach 2:
The system changes the heating parameters between two stages: in the first stage, high-frequency voltage is applied to electrodes to generate rapid heating for water evaporation; in the second stage, the voltage is reduced and a heating section is used for gradual solvent evaporation. This parameter change strategy maintains high drying efficiency while preventing thermal damage to the medium.
3Reliability
If the medium is heated to vaporize solvent, then complete drying is achieved, but the medium may undergo thermal denaturation
Solution Approach 1:
The system performs preliminary action by first rapidly evaporating water through high-frequency voltage applied to electrodes, removing the majority of liquid content before the medium is subjected to prolonged heating. This preliminary water removal reduces the total heating time required for subsequent solvent evaporation, thereby achieving complete drying while minimizing thermal denaturation risk.
Solution Approach 2:
The drying process maintains continuity of useful action by seamlessly transitioning from the first drying stage (high-frequency voltage for water evaporation) to the second drying stage (heating section for solvent evaporation). This continuous process ensures complete drying is achieved without interrupting the workflow, while the controlled transition prevents excessive thermal exposure that could cause denaturation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively dries the medium without thermal denaturation, improving drying performance and abrasion resistance while preserving medium quality.
Implementation Method 1
a heating section configured to heat the medium onto which the pigment ink was ejected by electromagnetic wave irradiation
Implementation Method 2
in a first period, vaporizes water contained in the pigment ink by heating the pigment ink that was ejected onto the medium and in a second period, vaporizes a solvent contained in the pigment ink by heating the pigment ink
Data Source
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AI summary
A drying device includes a heating section that heats a medium on which was ejected pigment ink containing a pigment, water, and a solvent, a first contact section that is provided between the heating section and the medium and that is configured to contact the medium, and a second contact section that is provided at a position sandwiching the medium with respect to the heating section and that is configured to contact the medium. The heating section, in a first period, vaporizes the water contained in the pigment ink by heating the pigment ink that was ejected onto the medium in a state where the medium is sandwiched between the first contact section and the second contact section and then, in a second period, vaporizes the solvent contained in the pigment ink by heating the pigment ink that was ejected onto the medium in a state where the medium is sandwiched between the first contact section and the second contact section. The drying device releases the medium from being sandwiched by the first contact section and the second contact section after the medium is heated by the heating section.